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Posts Tagged ‘Sooner State’

Oklahoma Hit by Another Significant Earthquake

Posted by feww on July 28, 2015

M4.5  quake strikes NNE of Crescent, Oklahoma

Centered at 36.006°N, 97.576°W the quake struck at a depth of 3.2 km (2.0 mi), reported USGS/EHP.

About 2,800 earthquakes measuring ≥2.5Mw have struck the Sooner State and the border area with Kansas over the past 365 days, a rise of 33.3 folds over the past five years.

Only 84 earthquakes of comparable magnitude occurred in the region during the 12 month to July 27, 2011.

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Another Swarm of Shallow Quakes Strikes Close to Oklahoma City

Posted by feww on February 18, 2014

Earthquake Hazard
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It Doesn’t Look Good!

At least 16 more shallow quakes measuring between M2.7 and M3.8 (possibly as large as 4.3Mw) struck Oklahoma February 15 – 17.

The latest cluster, one of several to strike Oklahoma since late last year,  occurred yet closer to Oklahoma City.

The swarm  raises the total number of shocks that have occurred in the Sooner State to 41 in the past 30 days, according to USGS/EHP.

OK EQs 18feb14
Earthquake Location Map. Oklahoma Earthquakes since February 15, 2014. Source: USGS/EHP

Details of the Most Significant Quake in the Past 24 Hours

  • Magnitude: 3.8Mw
  • Event Time:  04:54:59 UTC on 2014-02-17
  • Location: 35.785°N 97.471°W depth=4.8km (3.0mi)
  • Nearby Cities:
    • 11km (7mi) SSW of Guthrie, Oklahoma
    • 35km (22mi) N of Oklahoma City, Oklahoma

Tectonic Summary

Earthquakes in the Stable Continental Region – Natural Occurring Earthquake Activity
[Excerpts from USGS/EHP]

Most of North America east of the Rocky Mountains has infrequent earthquakes. Here and there earthquakes are more numerous, for example in the New Madrid seismic zone centered on southeastern Missouri, in the Charlevoix-Kamouraska seismic zone of eastern Quebec, in New England, in the New York – Philadelphia – Wilmington urban corridor, and elsewhere. However, most of the enormous region from the Rockies to the Atlantic can go years without an earthquake large enough to be felt, and several U.S. states have never reported a damaging earthquake.

Induced Seismicity

As is the case elsewhere in the world, there is evidence that some central and eastern North America earthquakes have been triggered or caused by human activities that have altered the stress conditions in earth’s crust sufficiently to induce faulting. Activities that have induced felt earthquakes in some geologic environments have included impoundment of water behind dams, injection of fluid into the earth’s crust, extraction of fluid or gas, and removal of rock in mining or quarrying operations. In much of eastern and central North America, the number of earthquakes suspected of having been induced is much smaller than the number of natural earthquakes, but in some regions, such as the south-central states of the U.S., a significant majority of recent earthquakes are thought by many seismologists to have been human-induced. Even within areas with many human-induced earthquakes, however, the activity that seems to induce seismicity at one location may be taking place at many other locations without inducing felt earthquakes. In addition, regions with frequent induced earthquakes may also be subject to damaging earthquakes that would have occurred independently of human activity. Making a strong scientific case for a causative link between a particular human activity and a particular sequence of earthquakes typically involves special studies devoted specifically to the question. Such investigations usually address the process by which the suspected triggering activity might have significantly altered stresses in the bedrock at the earthquake source, and they commonly address the ways in which the characteristics of the suspected human-triggered earthquakes differ from the characteristics of natural earthquakes in the region.

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State of Emergency Declared in OK due to Risk of Bridge Collapse

Posted by feww on February 8, 2014

FAILING INFRASTRUCTURE
STATE OF EMERGENCY

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Fallin declares State of Emergency after Purcell-Lexington bridge closure

Gov Fallin declared a State of Emergency in Cleveland and McClain counties, Okla., due to the closure of James C. Nance Memorial Bridge.

“The bridge we just went and saw was at risk of collapsing and still is at risk of collapsing,” said Fallin.

The bridge, which facilitates flow of commerce and trade between portions of six counties, was shut down by ODOT on January 31 due to major structural damage. Some 22 cracks were detected in the truss system.

Lexington and Purcell are less than two miles apart. However, since the bridge closure, the 40-mile detour takes about 50 minutes to drive, dramatically increasing commute times and fuel expenses.

“This bridge is a safety hazard and is at risk of collapse,” said Fallin. “Keeping it open would have threatened lives. It had to close. Unfortunately, that has created an economic hardship, not to mention a severe inconvenience, for the people of Lexington and Purcell.”

The bridge is said to be “similar” to the Minnesota I-35W bridge that collapsed in 2007.

Opened in 1938, the 1,110-meter (3,642 ft) long bridge crosses the Canadian River and is one of the longest in the Sooner State. The cost of rebuilding could top $40 million.

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